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  2. Vertical service code - Wikipedia

    en.wikipedia.org/wiki/Vertical_service_code

    A vertical service code (VSC) is a sequence of digits and the signals star (*) and pound/hash (#) dialed on a telephone keypad or rotary dial to access certain telephone service features. [1] Some vertical service codes require dialing of a telephone number after the code sequence.

  3. National conventions for writing telephone numbers - Wikipedia

    en.wikipedia.org/wiki/National_conventions_for...

    It is common to write phone numbers as (0xx) yyyyyyy, where xx is the area code. The 0 prefix is for trunk (long-distance) dialing from within the country. International callers should dial +92 xx yyyyyyyy. All mobile phone codes have four digits, and start with 03xx. All mobile numbers have seven digits, and denote the mobile provider on a ...

  4. List of telephony terminology - Wikipedia

    en.wikipedia.org/wiki/List_of_telephony_terminology

    Short Message Service (i.e. text messages) SF: Single Frequency supervision tone : US SIP: Session Initiation Protocol: US SP Lock: Unlocking: UK SS7: Signaling System 7 STD: Subscriber trunk dialling: UK and India T-CXR: T-carrier (e.g. T-1) US TAPI: Telephony Application Programming Interface TR: Tip and ring: US TSPS: Traffic Service ...

  5. Telephone keypad - Wikipedia

    en.wikipedia.org/wiki/Telephone_keypad

    Usually, this means that the caller just stops dialing at seven digits after the area code or that the extra digits are ignored by the telephone exchange. In early cell phones, or feature phones, the letters on the keys are used for text entry tasks such as text messaging, entering names in the phone book, and browsing the web.

  6. Category:Texting codes - Wikipedia

    en.wikipedia.org/wiki/Category:Texting_codes

    Below are articles of texting codes used to communicate on mobile phones or in on-line chats. Pages in category "Texting codes" The following 2 pages are in this category, out of 2 total.

  7. List of mobile telephone prefixes by country - Wikipedia

    en.wikipedia.org/wiki/List_of_mobile_telephone...

    Users can now switch carriers and keep their cell phone numbers, including prefix. An additional digit has been added to the code of every carrier. Making a single code per carrier, after each carrier had to have multiple codes. And making the NSN 10 digits after it was 9.

  8. Text messaging - Wikipedia

    en.wikipedia.org/wiki/Text_messaging

    An alternative to inbound SMS is based on long numbers (international mobile number format, e.g., +44 7624 805000, or geographic numbers that can handle voice and SMS, e.g., 01133203040 [44]), which can be used in place of short codes or premium-rated short messages for SMS reception in several applications, such as TV voting, [47] product ...

  9. List of international call prefixes - Wikipedia

    en.wikipedia.org/wiki/List_of_international_call...

    This is a list of international dialing prefixes used in various countries for direct dialing of international telephone calls.These prefixes are typically required only when dialling from a landline, while in GSM-compliant mobile phone (cell phone) systems, the symbol + before the country code may be used irrespective of where the telephone is used at that moment; the network operator ...